Have Pokemon 3 use Skill Swap on your Sturdy Pokemon, giving them the ability.

Have Pokemon 1 set up something for you to help out your team. It's not important what. as said before, you could give them Rapid Spin to help out Shedinja.

Have Pokemon 2 use Protect or something to keep them safe. You need them around to prevent hail and sand for Shedinja, so don't be reckless with them. If this one also has safeguard, you can just save time this turn and protect Shedinja.

Turn 2:

Have Pokemon 1 switch out, and send out Shedinja.

Have Pokemon 2 use Worry Seed on him, cancelling out his Wonder Guard ability. Since he would have a Focus Sash, he can last this turn without it. If you had your Cloud Nine Pokemon use Safeguard, this works just fine for him. Make sure the pokemon using Worry Seed is faster than the one with Skill Swap, so this can be pulled off in a single turn.

Have pokemon 3 use Skill swap on Shedinja to give him Sturdy.

Turn 3:

Have pokemon 3 use Safeguard if you didn't already have your other Pokemon do it the last turn.

Have Shedinja set up or attack whatever you want.

Do what you can to keep your Cloud Niner safe. You can also give him Taunt so that he can force opponents into attacking, instead of tricky moves that might screw Shedinja over.

Shedinja can't be hurt by direct attacks now, and most status based attacking is blocked off by his teammates. Consider something like heal pulse to support your other pokemon.

Notes:

When Safeguard wears off, you can use protect with Shedinja while setting it back up, since your opponent will likely take advantage of it and try to hit him again.

Shedinja is still prone to Mold Breaker, so Pinsir, rampardos, Haxorus, Excadrill, Throh, Sawk, Basculin, and Druddigon can break through him. (He doesn't have Wonder Guard now, so any type can hurt him)

Pokemon with the ability Magic Bounce, or Magic Guard can block off some attacks. This means Clefable, Sigilyph, Reuniclus, and Alakazam, as well as Xatu and Espeon can potentially screw you. Luckly, he has the type advantage against most of them, so he isn't completely defenseless against them.

That's the beauty though. Wonder Guard has nothing to do with the plan...the instructions are right there. You use worry Seed to cancel his Wonder Guard so that you can give him Sturdy. I know you can't skill swap wonder Guard.

I found out this really works for me in doubles!(Almost always works!^^) I get a slow pokemon with levitate like bronzong and have it use trick room. Then I use something like a power switch on shuckle, with trick room, shuckle is a BEAST on the field. I am able to almost OHKO anything that gets in the way with e-quake, stone edge, and gyro ball, toxic just adds up to the fun! ;)

The Absolute best combo (I love this one) is Aggron with Taunt and Metal Burst. If you give it a Focus Sash or Band It will give you a good chance of hanging on, and giving it Evs in Special Defense (like me) combined with its already strong defense makes for almost certain survival.
The best is when they THINK Aggron will fall to a 4x s.e. earthquake or water attack, and then..... BAM No move can escape metal burst, and not everyone expects it. After Taunt it's DEADLY!

Don't you hate Blissey's insanely low defense? Or an eviolite Chansey; it's Defense is still pretty low. Well, there is a way to improve that!

Have Blissey with Shuckle in a Double Battle. Same type of Shuckle as before, but this time, Shuckle should use Guard Split on Blissey/Chansey. Blissey should get around a 300 Defense, and 400 Special Defense. That's not that bad. Eviolite Chansey will get a 450 Defense and 600 Special Defense!

Umm... Hail to improve accuracy of Blizzard? Also, some move combos I see working are Charge Beam/Leaf Storm (to power up/restore Sp. Atk and do extra damage), Bestow/Recycle (you hold bad item, they hold a good berry, and you switch items and use yours continuously. This works really good with Gluttony.), Overheat/Haze (to restore Sp. Atk), Smack Down/Earthquake (to prepare Flying types and destroy them with Earthquake) Stealth Rock/Dragon Tail(to weaken the foe's entire team),and for Double Battles, I would suggest Heal Pulse/Water Spout, Swagger/Flatter on Own Tempo Pokemon, or Charge Beam on an Electric-type absorber.

Acupressure + Stored power
Even if your pokemon is special sweeper and Attack is boosted, stored power's damage is increased. Also acupressure is the only way to make stored power reach the ultimate 860 base damage.

EDIT: Oooops, there's no pokemon that can learn acupressure and stored power, so maybe batton pass acupressure with an Eeeve, or an Eevelution.

Why not calm mind + stored power?
Acupressure raises a stat by 2 (boni) but calm mind raises two stats with 1 bonus. So that means calm mind has the same effect on stored power, no? Also the sp. atk is raised.

take a raichu that can learn charge beam and another pokemon with lightningrod manectric
and use charge beam on the pokemon which would raise manectric and possibly raichu

also politoad drizzle and a pokemon with rain dish blastoise
glacion with snow cloak and leftovers ( it helps )
or ice body and leftovers mmmmmm
ooo this is cool one gliscor with fling holding a toxic orb or poison barb with poison heal
1 heals yourself deals damage and either poisons opponent or does nothing

Try this set it will trap your opponent completely!
Ok so have a Poke'mon with this moveset:

Roost

Feather Dance

Sucker Punch

Taunt

And this set:

Mean Look

Psychic (Your Choice.)

Heal Pulse

Earthquake

Set one Strategy:

Here is how you use it Start up with a use Taunt Attack to Make the opponent use offensive moves for sure, Then, use a Feather Dance to lower it's Attack, After that, use a Sucker Punch that is sure to hit, (With alot of Power!). Roost is to heal all the damage it's taken while doing this. Keep doing this for Ultimate power! Try out an Metronome or a Leftovers as an item.

The trick here is that you set up your team so that zoroark will be disguised as a Toxicroak, which is pretty much the perfect pokemon for zoroark to look like. With toxicroak's 4X weakness to psychic, and zoroark's immunity to it, you are often able to set up with nasty plot and use dark pulse to belt the fool who switched in with a psychic type. Also, HP ice covers all of toxicroak's non-psychic weaknesses, effectively murdering anything that switches in on zoroark for what they believe is a type advantage. One more thing that makes this strategy ruthless is that Toxicroak can learn all of the moves in this set, leaving less suspicion as to whether it is an actual Toxicroak.

I watched my brother battle the other day and someone pulled it on him, trick room is negative priority, so you'll probably have your sash broken ( use something with frail defenses ) now you'll go first with destiny bond and take down your opponent.